Renban Groups Sudoku (Fun With Sudoku #96)

While marking practice puzzles for Sudoku Mahabharat 2016 Episode 2, I realized that I have not yet posted the Sudoku puzzles which I prepared for the last year Sudoku Mahabharat Neighbours round yet. So I am posting this Renban Groups Sudoku which could be used as practice for Episode 2 of Sudoku Mahabharat. I have prepared some Repeated Neibhours Sudoku too, which are under testing. This is the reason, I have not posted these puzzles yet. Do mail me in case you want to get these puzzles by mail.